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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
8e274523 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
8e274523 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
8e274523 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8e274523 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <sys/mount.h> | |
23 | #include <errno.h> | |
24 | #include <sys/stat.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <libgen.h> | |
28 | #include <assert.h> | |
5c0532d1 | 29 | #include <unistd.h> |
1829dc9d | 30 | #include <ftw.h> |
8e274523 LP |
31 | |
32 | #include "mount-setup.h" | |
5ba2dc25 | 33 | #include "dev-setup.h" |
8e274523 | 34 | #include "log.h" |
c9af1080 LP |
35 | #include "macro.h" |
36 | #include "util.h" | |
5275d3c1 | 37 | #include "label.h" |
0c85a4f3 LP |
38 | #include "set.h" |
39 | #include "strv.h" | |
49e942b2 | 40 | #include "mkdir.h" |
9eb977db | 41 | #include "path-util.h" |
48ac500b | 42 | #include "missing.h" |
c481f78b | 43 | #include "virt.h" |
34e5a31e | 44 | #include "efivars.h" |
8552b176 | 45 | #include "smack-util.h" |
7f112f50 | 46 | #include "def.h" |
bef2733f | 47 | |
6aa220e0 KS |
48 | typedef enum MountMode { |
49 | MNT_NONE = 0, | |
50 | MNT_FATAL = 1 << 0, | |
51 | MNT_IN_CONTAINER = 1 << 1, | |
52 | } MountMode; | |
53 | ||
ca714c0e LP |
54 | typedef struct MountPoint { |
55 | const char *what; | |
56 | const char *where; | |
57 | const char *type; | |
58 | const char *options; | |
59 | unsigned long flags; | |
6aa220e0 KS |
60 | bool (*condition_fn)(void); |
61 | MountMode mode; | |
ca714c0e LP |
62 | } MountPoint; |
63 | ||
4ef31082 | 64 | /* The first three entries we might need before SELinux is up. The |
160481f6 | 65 | * fourth (securityfs) is needed by IMA to load a custom policy. The |
7c96ab1d LP |
66 | * other ones we can delay until SELinux and IMA are loaded. When |
67 | * SMACK is enabled we need smackfs, too, so it's a fifth one. */ | |
68 | #ifdef HAVE_SMACK | |
ffbd2c4d | 69 | #define N_EARLY_MOUNT 5 |
7c96ab1d LP |
70 | #else |
71 | #define N_EARLY_MOUNT 4 | |
72 | #endif | |
4ef31082 | 73 | |
ca714c0e | 74 | static const MountPoint mount_table[] = { |
68d4c452 LP |
75 | { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
76 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
77 | { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
78 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
79 | { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, | |
80 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
81 | { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
82 | NULL, MNT_NONE }, | |
d407c940 | 83 | #ifdef HAVE_SMACK |
68d4c452 LP |
84 | { "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
85 | mac_smack_use, MNT_FATAL }, | |
86 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, | |
87 | mac_smack_use, MNT_FATAL }, | |
d407c940 | 88 | #endif |
68d4c452 LP |
89 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
90 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
91 | { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, | |
92 | NULL, MNT_IN_CONTAINER }, | |
d407c940 | 93 | #ifdef HAVE_SMACK |
68d4c452 LP |
94 | { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
95 | mac_smack_use, MNT_FATAL }, | |
d407c940 | 96 | #endif |
68d4c452 LP |
97 | { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
98 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
99 | { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, | |
100 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
101 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
102 | NULL, MNT_IN_CONTAINER }, | |
103 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
104 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
105 | { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
106 | NULL, MNT_NONE }, | |
c06bf414 | 107 | #ifdef ENABLE_EFI |
68d4c452 LP |
108 | { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
109 | is_efi_boot, MNT_NONE }, | |
c06bf414 | 110 | #endif |
63cc4c31 DM |
111 | #ifdef ENABLE_KDBUS |
112 | { "kdbusfs", "/sys/fs/kdbus", "kdbusfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
113 | NULL, MNT_IN_CONTAINER }, | |
114 | #endif | |
115 | }; | |
116 | ||
949c6510 | 117 | /* These are API file systems that might be mounted by other software, |
46ff0ed7 | 118 | * we just list them here so that we know that we should ignore them */ |
949c6510 | 119 | |
eaeb18db LP |
120 | static const char ignore_paths[] = |
121 | /* SELinux file systems */ | |
122 | "/sys/fs/selinux\0" | |
123 | "/selinux\0" | |
124 | /* Legacy cgroup mount points */ | |
125 | "/dev/cgroup\0" | |
126 | "/cgroup\0" | |
127 | /* Legacy kernel file system */ | |
128 | "/proc/bus/usb\0" | |
129 | /* Container bind mounts */ | |
130 | "/proc/sys\0" | |
131 | "/dev/console\0" | |
c481f78b | 132 | "/proc/kmsg\0"; |
949c6510 | 133 | |
dad08730 LP |
134 | bool mount_point_is_api(const char *path) { |
135 | unsigned i; | |
136 | ||
137 | /* Checks if this mount point is considered "API", and hence | |
138 | * should be ignored */ | |
139 | ||
ca714c0e | 140 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) |
449ddb2d | 141 | if (path_equal(path, mount_table[i].where)) |
dad08730 LP |
142 | return true; |
143 | ||
57f2a956 KS |
144 | return path_startswith(path, "/sys/fs/cgroup/"); |
145 | } | |
146 | ||
147 | bool mount_point_ignore(const char *path) { | |
eaeb18db | 148 | const char *i; |
57f2a956 | 149 | |
eaeb18db LP |
150 | NULSTR_FOREACH(i, ignore_paths) |
151 | if (path_equal(path, i)) | |
949c6510 LP |
152 | return true; |
153 | ||
57f2a956 | 154 | return false; |
dad08730 LP |
155 | } |
156 | ||
4ef31082 | 157 | static int mount_one(const MountPoint *p, bool relabel) { |
8e274523 LP |
158 | int r; |
159 | ||
ca714c0e | 160 | assert(p); |
8e274523 | 161 | |
6aa220e0 KS |
162 | if (p->condition_fn && !p->condition_fn()) |
163 | return 0; | |
164 | ||
51b4af2c | 165 | /* Relabel first, just in case */ |
4ef31082 | 166 | if (relabel) |
c9bc0764 | 167 | label_fix(p->where, true, true); |
51b4af2c | 168 | |
c481f78b LP |
169 | r = path_is_mount_point(p->where, true); |
170 | if (r < 0) | |
8e274523 LP |
171 | return r; |
172 | ||
173 | if (r > 0) | |
51b4af2c | 174 | return 0; |
8e274523 | 175 | |
c481f78b | 176 | /* Skip securityfs in a container */ |
6aa220e0 | 177 | if (!(p->mode & MNT_IN_CONTAINER) && detect_container(NULL) > 0) |
c481f78b LP |
178 | return 0; |
179 | ||
a04f58d6 LP |
180 | /* The access mode here doesn't really matter too much, since |
181 | * the mounted file system will take precedence anyway. */ | |
c4bfd169 LP |
182 | if (relabel) |
183 | mkdir_p_label(p->where, 0755); | |
184 | else | |
185 | mkdir_p(p->where, 0755); | |
a04f58d6 | 186 | |
8e274523 | 187 | log_debug("Mounting %s to %s of type %s with options %s.", |
ca714c0e LP |
188 | p->what, |
189 | p->where, | |
190 | p->type, | |
191 | strna(p->options)); | |
192 | ||
193 | if (mount(p->what, | |
194 | p->where, | |
195 | p->type, | |
196 | p->flags, | |
197 | p->options) < 0) { | |
99a17ada | 198 | log_full((p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG, "Failed to mount %s at %s: %m", p->type, p->where); |
6aa220e0 | 199 | return (p->mode & MNT_FATAL) ? -errno : 0; |
8e274523 LP |
200 | } |
201 | ||
51b4af2c | 202 | /* Relabel again, since we now mounted something fresh here */ |
4ef31082 | 203 | if (relabel) |
c9bc0764 | 204 | label_fix(p->where, false, false); |
5275d3c1 | 205 | |
0c85a4f3 | 206 | return 1; |
8e274523 LP |
207 | } |
208 | ||
4ef31082 LP |
209 | int mount_setup_early(void) { |
210 | unsigned i; | |
211 | int r = 0; | |
212 | ||
213 | assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table)); | |
214 | ||
215 | /* Do a minimal mount of /proc and friends to enable the most | |
216 | * basic stuff, such as SELinux */ | |
217 | for (i = 0; i < N_EARLY_MOUNT; i ++) { | |
218 | int j; | |
219 | ||
220 | j = mount_one(mount_table + i, false); | |
221 | if (r == 0) | |
222 | r = j; | |
223 | } | |
224 | ||
225 | return r; | |
226 | } | |
227 | ||
0c85a4f3 | 228 | int mount_cgroup_controllers(char ***join_controllers) { |
a6b26d90 ZJS |
229 | _cleanup_set_free_free_ Set *controllers = NULL; |
230 | _cleanup_fclose_ FILE *f; | |
a641dcd9 LP |
231 | char buf[LINE_MAX]; |
232 | int r; | |
2076ca54 | 233 | |
670802d4 | 234 | /* Mount all available cgroup controllers that are built into the kernel. */ |
2076ca54 | 235 | |
0c85a4f3 LP |
236 | f = fopen("/proc/cgroups", "re"); |
237 | if (!f) { | |
56f64d95 | 238 | log_error_errno(errno, "Failed to enumerate cgroup controllers: %m"); |
016e9849 LP |
239 | return 0; |
240 | } | |
2076ca54 | 241 | |
d5099efc | 242 | controllers = set_new(&string_hash_ops); |
a6b26d90 ZJS |
243 | if (!controllers) |
244 | return log_oom(); | |
0c85a4f3 | 245 | |
2076ca54 | 246 | /* Ignore the header line */ |
bab45044 | 247 | (void) fgets(buf, sizeof(buf), f); |
2076ca54 LP |
248 | |
249 | for (;;) { | |
0c85a4f3 LP |
250 | char *controller; |
251 | int enabled = 0; | |
2076ca54 | 252 | |
16f6682d | 253 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { |
2076ca54 LP |
254 | |
255 | if (feof(f)) | |
256 | break; | |
257 | ||
258 | log_error("Failed to parse /proc/cgroups."); | |
a6b26d90 | 259 | return -EIO; |
2076ca54 LP |
260 | } |
261 | ||
600a328f LP |
262 | if (!enabled) { |
263 | free(controller); | |
264 | continue; | |
265 | } | |
266 | ||
ef42202a | 267 | r = set_consume(controllers, controller); |
0c85a4f3 LP |
268 | if (r < 0) { |
269 | log_error("Failed to add controller to set."); | |
a6b26d90 | 270 | return r; |
0c85a4f3 LP |
271 | } |
272 | } | |
273 | ||
274 | for (;;) { | |
a641dcd9 | 275 | _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL; |
a6b26d90 ZJS |
276 | MountPoint p = { |
277 | .what = "cgroup", | |
278 | .type = "cgroup", | |
279 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
280 | .mode = MNT_IN_CONTAINER, | |
281 | }; | |
0c85a4f3 LP |
282 | char ***k = NULL; |
283 | ||
284 | controller = set_steal_first(controllers); | |
285 | if (!controller) | |
286 | break; | |
287 | ||
288 | if (join_controllers) | |
289 | for (k = join_controllers; *k; k++) | |
290 | if (strv_find(*k, controller)) | |
291 | break; | |
292 | ||
293 | if (k && *k) { | |
294 | char **i, **j; | |
295 | ||
296 | for (i = *k, j = *k; *i; i++) { | |
297 | ||
298 | if (!streq(*i, controller)) { | |
a641dcd9 | 299 | _cleanup_free_ char *t; |
0c85a4f3 LP |
300 | |
301 | t = set_remove(controllers, *i); | |
302 | if (!t) { | |
303 | free(*i); | |
304 | continue; | |
305 | } | |
0c85a4f3 LP |
306 | } |
307 | ||
308 | *(j++) = *i; | |
309 | } | |
310 | ||
311 | *j = NULL; | |
312 | ||
313 | options = strv_join(*k, ","); | |
a6b26d90 ZJS |
314 | if (!options) |
315 | return log_oom(); | |
0c85a4f3 LP |
316 | } else { |
317 | options = controller; | |
318 | controller = NULL; | |
319 | } | |
320 | ||
a641dcd9 LP |
321 | where = strappend("/sys/fs/cgroup/", options); |
322 | if (!where) | |
323 | return log_oom(); | |
324 | ||
325 | p.where = where; | |
0c85a4f3 | 326 | p.options = options; |
2076ca54 | 327 | |
4ef31082 | 328 | r = mount_one(&p, true); |
a6b26d90 ZJS |
329 | if (r < 0) |
330 | return r; | |
0c85a4f3 LP |
331 | |
332 | if (r > 0 && k && *k) { | |
333 | char **i; | |
334 | ||
335 | for (i = *k; *i; i++) { | |
a641dcd9 LP |
336 | _cleanup_free_ char *t = NULL; |
337 | ||
338 | t = strappend("/sys/fs/cgroup/", *i); | |
339 | if (!t) | |
340 | return log_oom(); | |
0c85a4f3 LP |
341 | |
342 | r = symlink(options, t); | |
0c85a4f3 | 343 | if (r < 0 && errno != EEXIST) { |
56f64d95 | 344 | log_error_errno(errno, "Failed to create symlink %s: %m", t); |
a6b26d90 | 345 | return -errno; |
0c85a4f3 LP |
346 | } |
347 | } | |
348 | } | |
2076ca54 LP |
349 | } |
350 | ||
679142ce LP |
351 | /* Now that we mounted everything, let's make the tmpfs the |
352 | * cgroup file systems are mounted into read-only. */ | |
353 | mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755"); | |
354 | ||
a6b26d90 | 355 | return 0; |
2076ca54 LP |
356 | } |
357 | ||
0fff82e5 | 358 | #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
1829dc9d LP |
359 | static int nftw_cb( |
360 | const char *fpath, | |
361 | const struct stat *sb, | |
362 | int tflag, | |
363 | struct FTW *ftwbuf) { | |
364 | ||
9fe117ea | 365 | /* No need to label /dev twice in a row... */ |
edb49778 LP |
366 | if (_unlikely_(ftwbuf->level == 0)) |
367 | return FTW_CONTINUE; | |
368 | ||
c9bc0764 | 369 | label_fix(fpath, false, false); |
af65c248 | 370 | |
edb49778 | 371 | /* /run/initramfs is static data and big, no need to |
af65c248 | 372 | * dynamically relabel its contents at boot... */ |
edb49778 LP |
373 | if (_unlikely_(ftwbuf->level == 1 && |
374 | tflag == FTW_D && | |
375 | streq(fpath, "/run/initramfs"))) | |
376 | return FTW_SKIP_SUBTREE; | |
9fe117ea | 377 | |
edb49778 | 378 | return FTW_CONTINUE; |
1829dc9d | 379 | }; |
0fff82e5 | 380 | #endif |
1829dc9d | 381 | |
0b3325e7 | 382 | int mount_setup(bool loaded_policy) { |
dad08730 | 383 | unsigned i; |
68d4c452 | 384 | int r = 0; |
8e274523 | 385 | |
4ef31082 | 386 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) { |
68d4c452 | 387 | int j; |
4ef31082 | 388 | |
68d4c452 LP |
389 | j = mount_one(mount_table + i, loaded_policy); |
390 | if (r == 0) | |
391 | r = j; | |
4ef31082 | 392 | } |
8e274523 | 393 | |
68d4c452 LP |
394 | if (r < 0) |
395 | return r; | |
396 | ||
0fff82e5 | 397 | #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
f1d19aa4 LP |
398 | /* Nodes in devtmpfs and /run need to be manually updated for |
399 | * the appropriate labels, after mounting. The other virtual | |
400 | * API file systems like /sys and /proc do not need that, they | |
401 | * use the same label for all their files. */ | |
0b3325e7 LP |
402 | if (loaded_policy) { |
403 | usec_t before_relabel, after_relabel; | |
404 | char timespan[FORMAT_TIMESPAN_MAX]; | |
405 | ||
406 | before_relabel = now(CLOCK_MONOTONIC); | |
407 | ||
edb49778 LP |
408 | nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
409 | nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
0b3325e7 LP |
410 | |
411 | after_relabel = now(CLOCK_MONOTONIC); | |
412 | ||
413 | log_info("Relabelled /dev and /run in %s.", | |
2fa4092c | 414 | format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); |
3bbecb2f | 415 | } |
0fff82e5 | 416 | #endif |
1829dc9d | 417 | |
5c0532d1 | 418 | /* Create a few default symlinks, which are normally created |
f1d19aa4 | 419 | * by udevd, but some scripts might need them before we start |
5c0532d1 | 420 | * udevd. */ |
01ed0e23 | 421 | dev_setup(NULL); |
5c0532d1 | 422 | |
b3ac5f8c LP |
423 | /* Mark the root directory as shared in regards to mount |
424 | * propagation. The kernel defaults to "private", but we think | |
425 | * it makes more sense to have a default of "shared" so that | |
426 | * nspawn and the container tools work out of the box. If | |
427 | * specific setups need other settings they can reset the | |
428 | * propagation mode to private if needed. */ | |
c481f78b LP |
429 | if (detect_container(NULL) <= 0) |
430 | if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) | |
56f64d95 | 431 | log_warning_errno(errno, "Failed to set up the root directory for shared mount propagation: %m"); |
b3ac5f8c | 432 | |
66e41181 LP |
433 | /* Create a few directories we always want around, Note that |
434 | * sd_booted() checks for /run/systemd/system, so this mkdir | |
435 | * really needs to stay for good, otherwise software that | |
436 | * copied sd-daemon.c into their sources will misdetect | |
437 | * systemd. */ | |
d2e54fae KS |
438 | mkdir_label("/run/systemd", 0755); |
439 | mkdir_label("/run/systemd/system", 0755); | |
c17ec25e | 440 | mkdir_label("/run/systemd/inaccessible", 0000); |
b925e726 | 441 | |
0c85a4f3 | 442 | return 0; |
8e274523 | 443 | } |